<template>
  <div class="todo-header">
    <input
      type="text"
      placeholder="请输入你的任务名称，按回车键确认"
      @keyup.enter="add"
    />
  </div>
</template>

<script>
import { nanoid } from "nanoid"; //分别暴露，暴露出来的为一个函数
export default {
  name: "HeaderVue",
  methods: {
    add(e) {
      //将用户的输入包装为一个对象
      //判断输入是否为空
      if (e.target.value.trim() !== "") {
        const todoObj = {
          id: nanoid(),
          title: e.target.value.trim(),
          done: false,
        };
        this.$emit("receive", todoObj);
        e.target.value = "";
      } else {
        alert("输入不能为空！！！");
      }
    },
  },
};
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>